Parallax-Scroll is a jQuery plugin to create elements with background images that behaves as if their background-attachment property is between scroll and fixed, similar to the parallax scrolling effect you see on Spotify

Parallax.js is simple, lightweight Parallax Engine that reacts to the orientation of a smart device. Where no gyroscope or motion detection hardware is available, the position of the cursor is used instead.

Starscroll is a jQuery plugin that adds a fullscreen starfield, generated in canvas, controlled by css to any div. The parallax responds when user scrolls (no matter how big your content), or when is set to animate.